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Douglas Bailey, Professor, and Brian Whipker, Extension Horticulture Specialist - page 16 / 16

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Table 1, continued.

Crop

Vinca, continued

Purpose To control plant height

Product Sumagic

Application Method & Rate

1 to 3 ppm spray (0.26 to 0.77 fl oz/gal)

See Ageratum.

Precautions & Remarks

Vinca Vine (Vinca spp.)

To increase lateral branching

Florel

Viola

To control plant height

Sumagic

Wandering Jew

To control plant height

A-Rest

Woody Landscape

To control plant height

A-Rest

Plants (Not specifically listed in this table)

Bonzi

500 ppm spray (1.619 fl oz/gal)

1 to 5 ppm spray (0.26 to 1.28 fl oz/gal)

26 to 132 ppm spray (12.6 to 64 fl oz/gal)

50 ppm spray (24.2 fl oz/gal)

0.25 mg a.i. drench for a 6 inch pot (1 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)

0.473 mg a.i. drench for a 6 inch pot (0.128 fl oz/gal of drench solution; apply 4 fl oz/6 inch pot)

Florel applications will provide some growth retardant effects. A delay in flowering will also occur with the use of Florel. Read the label for restrictions on timing of applications.

See Ageratum.

Drench volumes and mg a.i. vary with pot size. Contact floricultural specialists at NC State University.

See Bedding Plants

100 ppm spray (3.2 fl oz/gal)

A-Rest

7 to 26 ppm spray (3.4 to 12.6 fl oz/gal)

B-Nine

2,500 to 5,000 ppm spray (0.39 to 0.79 oz/gal)

Bonzi

5 to 45 ppm spray (0.16 to 1.45 fl oz/gal)

Cycocel

400 to 3,000 ppm spray (0.43 to 3.25 fl oz/gal)

Zinnia

To control plant height

See Ageratum.

(Continued from Page 4)

holiday cactus in stimulating branching when applied during the vegetative phase and is effective in increasing the number of flower buds when applied during reproductive conditions; but no product is labeled for this use. Accel (N-Benzyl- 9-[2-tetrahydropyranyl]adenine [BPA] is the active ingredient) was labeled for increasing lateral branching in carnation and roses, but will not be available after current supplies are depleted.

Research on floricultural crops has shown many other potential uses for PGR’s, such as

gibberellic acid (GA3) substituting for cold storage of hydrangea and hastening flowering of cyclamen; however, only those uses listed on a product label can be implemented legally. Plant growth regulators are regarded as pesticides, and it is a violation of Federal and State Law to use these products in a manner inconsistent with their labeling. Hopefully, expansion of current labeling will be possible in the future to allow growers to take advantage of research results showing more efficient cropping and higher quality plants through best management utilization of plant growth regulators.

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